tree 135c3a80b21ce478816229dc82586b12754eb49f
parent b92dccf65bab3b6b7deb79ff3321dc256eb0f53b
author Trond Myklebust <Trond.Myklebust@netapp.com> 1142880244 -0500
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1142880244 -0500

NFS: Avoid races between writebacks and truncation

Currently, there is no serialisation between NFS asynchronous writebacks
and truncation at the page level due to the fact that nfs_sync_inode()
cannot lock the pages that it is about to write out.

This means that it is possible to be flushing out data (and calling something
like set_page_writeback()) while the page cache is busy evicting the page.
Oops...

Use the hooks provided in try_to_release_page() to ensure that dirty pages
are always written back to storage before we evict them.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>